Run results for: set.has vs object key lookup vs array includes

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser: Chrome 114

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 9 months ago

Test name	Executions per second
includes	17980640.0 Ops/sec
key lookup	17402100.0 Ops/sec
set has	18025800.0 Ops/sec

Script Preparation code:

var a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var b = {1: true, 2: true, 3: true, 4: true, 5: true, 6: true, 7: true, 8: true, 9: true, 10: true}
var c = new Set(a);

Tests:

includes
return a.includes(9)
key lookup
return !!b['9']
set has
return c.has(9)

Run results for: set.has vs object key lookup vs array includes

includes

key lookup

set has